以蒙脱石、Cu~(2+)、Zn~(2+)、十六烷基吡啶(CP)等为主要原料,制备Cu~(2+)-ZnO/十六烷基吡啶-蒙脱石(CZCM)复合抗菌材料,并对其结构、表面特性和抗菌活性进行表征.结果表明,在蒙脱石悬浮液中,Zn~(2+)按蒙脱石离子交换容量(CEC)摩尔比0.75倍的量加入,经搅拌、碱沉淀、煅烧、粉碎,加水悬浮后,再按蒙脱石CEC的0.75和0.4倍量分别加入Cu~(2+)和CP,可制得Cu~(2+)、ZnO和CP含量分别为3.04%、3.71%和6.62%的CZCM抗菌材料.与蒙脱石相比,CZCM的层间距和孔径增大;CEC、比表面积、微孔比表面积和微孔体积缩小;外比表面积和孔体积增大;总电荷、层间电荷和端面电荷的绝对值下降;Zeta电位升高.抗菌活性测定数据显示:CZCM对病原大肠杆菌和鼠伤寒沙门氏菌均有较强的抗菌活性.
Cu~(2+)-ZnO/cetylpyridinium-montmorillonite (CZCM) was prepared by using Cu~(2+), Zn~(2+), cetylpyridinium (CP), and montmorillonite (MMT). The structure, characteristic, and antibacterial activity of CZCM were comparatively investigated. The results show that zinc ion is added in the MMT suspension at an amount of 0.75 times the cation exchange capacity (CEC) of MMT. The mixture is agitated, basified, calcined, ground, and suspended, and then both Cu~(2+) and CP are added at the amount of 0.75 and 0.40 times the CEC of MMT, respectively. The antibacterial CZCM, which contained 3.04% Cu~(2+), 3.71% ZnO, and 6.62 % CP, is prepared. As compared to MMT, layer diameter, pore diameter, external surface area and pore volume of CZCM are relatively high, while CEC, specific surface area, micropore surface area and micropore volume are low. Absolute values of total charge, layer charge and edge charge of CZCM are lower than those of MMT. Zeta potential of CZCM is positive as compared to that of MMT. Data obtained from antibacterial activity assay show that CZCM has a high antibacterial activity to pathogenic Escherichia coli and Salmonella typhimurium.
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